JPS5854318A - Production for liquid crystal display panel - Google Patents

Abstract

PURPOSE:To produce a long-life and high-reliability liquid crystal display panel, by combining and using an A-side substrate provided with a spacer and seal part and a B-side substrate where a granular spacer is dispersed and applied uniformly and a short-circuit part is provided by a specific method. CONSTITUTION:In a process (i), a seal part (used as a spacer part also) 6 is formed on the periphery of an A-side glass substrate 1 by screen printing (a notch 7 is provided as a hole for charging a liquid crystal); and in a process (ii), a granular spacer (such as glass beads) 11 is applied uniformly onto a B- side glass substrate 2 by spinner application or the like, and a conductive paste is applied in a desired position with a screen 14, which has such structure that a center part 16 is not brought into abutment on the print face (the substrate 2), (12, 15 and 13 in figure indicate a screen frame, an emulsion coated face, and a squeegee respectively) to form a short-circuit part 9. Consequently, the granular spacer 11 applied beforehand is not changed at all in the process for forming the short-circuit part 9. Next, in a process (iii), substrates 1 and 2 are combined and the liquid crystal is sealed in accordance with conventional method, thus forming a panel.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a liquid crystal display panel in a display panel section of an information processing input/output terminal device, etc., and relates to a liquid crystal display panel in a display panel section of an information processing input/output terminal device, etc. ! The present invention relates to a method for manufacturing a liquid crystal display panel, which provides means for assembling the display panel, in which the formation of the integral part is easy and the spacer part provided between the glass substrates is easy to form.

Conventionally, this type of liquid crystal display panel has been put to practical use in numeric display panels for wristwatches, calculators, and the like. However, in order to further expand the display panel area and realize a stable, uniform, and high-contrast display over such a wide area at a low cost, it has been difficult or troublesome in the past to have the plurality of short-circuit connections (hereinafter referred to as short-circuit connections). It is necessary to solve a number of problems in the formation of spacers (referred to as spacers) and the formation of micro-gaps between substrates with high precision.

An outline of the structure of a conventional display panel of this type will be described with reference to the front view of the panel in FIG. 1 and the sectional side view of the panel in FIG.
11i - Explain 0 In the figure, 1 is a glass substrate (A
side glass substrate), 2 is a glass substrate (B @ glass substrate) that faces the A side glass substrate with a micro gap 3, 4 and 5 are indium KII chloride (Ingo,
) etc. are vapor-deposited to create uniform parallel voids at any position of the light transmittance, and the core void space is filled with liquid crystal, and the sealed part of the 6ij liquid crystal enclosure (the shaded area around the panel display surface) It is also a spacer part for forming voids. 7 is a sealing part after filling the liquid crystal.

The front view of the panel shows pixel element 8, which forms a multi-digit display of the joint.
Here is an example of how the following is arranged. The pixel element 8 has an electrode configuration of 7 segments per single number, and if this is formed on the transparent electrode 5 side, the opposing transparent electrode 4 side will be formed as a solid common electrode, but the common electrode 4 is not suitable. The redundant division makes the electrodes low resistance and prevents a drop in display contrast when driving a liquid crystal cell. Reference numeral 9 denotes a plurality of short circuit parts according to the present invention, which are electrically connected to the common electrode 4 and connected to the glass substrate 2.
This is the part connected to the side panel electrode terminal 10.

(not shown) A light cell for a display is formed. The photocell is used for optical display by selectively applying a low voltage alternating current between specific IIE electrodes of the transparent electrodes 4 and 5 to rotate the alignment axis of liquid crystal molecules between the specific electrodes. The transparent electrode surface is subjected to front surface treatment to facilitate orientation of crystalline molecules.

Incidentally, the conventional assembly of the above-mentioned constituent panels is carried out by pasting the A-side glass substrate 1 and the B-side glass substrate 2 together or by adhering both substrates. In this assembly, first, a spacer part (or seal part) to ensure a microgap is formed on the t-A side of the glass substrate, and the seal part 6 is formed on the other side of the glass substrate B@.
The granular spacers are uniformly dispersed in the plane surrounded by the spacer to create parallel micro-gaps.Next, on the B-side glass substrate, a silver base material paste is applied by screen printing to the preformed panel electrodes at the required positions. A plurality of short circuit parts are formed. However, when bonding the glass substrates on the rear side and KB side, the following problem arises.

(1) When printing a conductive paste on the B-side glass substrate with spacers pre-formed, the granular spacers adhere to the screen made of silk or the like and are removed. (2) The screen original plate is directly printed on the transparent glass substrate. When you touch the electrode,
It damages the alignment treated surface of the electrode surface and tends to cause domains with poor liquid crystal alignment.

(3) In order to avoid the disadvantages mentioned in (1) above, when printing the conductive paste on the A-side glass substrate, the screen original comes into contact with the pre-formed seal portion, and the thickness of the sealant coating changes.

(4) If the panel is assembled in the condition described in (1) above, interference fringes will occur on the panel display surface because the parallel gaps between the substrates will not be in fiber contact.

An object of the present invention is to solve the above-mentioned problems and to present a panel assembly method that is easy to mass produce.The main features of the present invention are that the seal portion is formed on the A side of the glass substrate, and the spacer S is formed on the glass substrate side. Figures 3 to 6 show a method of manufacturing a liquid crystal display panel, in which a display panel is assembled by uniformly dispersing and forming the entire surface of the B side, and then bonding these A side and B side glass substrates. It is a figure explaining the invention in detail.

FIG. 3 is a perspective view of the seal portion 6 screen printed along the periphery of the glass substrate 10 on the A side, and FIG. FIG. 2 is a perspective view of a substrate in which a large number of the short circuit portions 9 are simultaneously provided by screen printing and subsequent to the spacer coating. Although not shown, the transparent electrodes are preformed on the glass substrates 1 and 2 in FIGS. 3 and 4.

The seal part 6Fi in FIG. 3, the micro gap 3 between the opposing substrates (
(See FIG. 2), and after thermocompression bonding and assembly with the opposing glass substrate 2, a printed film thickness is formed that provides an appropriate void value within the range of 5 to 15 μm.

7 in the figure is a liquid crystal injection hole shell part formed by cutting out a corner of the seal part 6 (see FIG. 1).

The spacers 11, which are dispersed and coated in countless numbers on the surface of the lath substrate 2 on the B side in FIG. 4, are made of, for example, plastic beads or glass beads, and can be easily applied by applying a certain amount using a spinner. The support means for producing the 2Km junction 9 on the glass substrate after spinner coating will be explained with reference to FIGS. 5 and 6, which show the screen printing means tube.

In FIG. 5, 12 screen printing frames, 13 a squeegee for printing, 14 a screen on which a printed pattern has been omitted, and the emulsion coating surface forming a 15#i screen masking. However, the central part 16 of the screen 14 shown in the figure is a screen and emulsion coating surface that is different from a normal printing screen, and has a screen structure that does not contact the short-circuit printed substrate in close contact with the bottom. . This is to ensure that the spacers previously formed on the substrate remain when printing the conductive paste using the squeegee 13.

FIG. 6 shows another embodiment different from that shown in FIG. 5, in which the squeegee itself 13 is provided with a recessed portion as shown in FIG. 17 to represent the retention of the spacer as a means for achieving the purpose.

The B-side glass substrate (perspective view m- in FIG. 4) using the short-circuit forming means as described above and the A-like glass substrate on which the sealing portion has been formed are stacked together and pressed at a predetermined temperature to form a predetermined microgap. After joining, the assembly of the board panel is completed.

According to the short circuit forming means of the present invention, the following advantages and effects can be expected. (1) Uniform display contrast can be obtained because the spacer is provided in the central region of the display panel.

(no) A stable liquid crystal display panel can be formed without the possibility of moisture, dust, or other contaminants adhering to the display electrode surface or the liquid crystal alignment film surface.

(3) The conventional non-uniformity of the short circuit film thickness has been resolved,
Improves reliability of connections.

(4) Highly reliable and long-life liquid crystal panel'f: Can be realized.

From this point of view, the method for manufacturing a liquid crystal display panel according to the present invention has good mass productivity and high industrial effects.

[Brief explanation of drawings]

FIG. 1 is a front view of a panel explaining the structure of a conventional liquid crystal display panel, FIG. 2 is a sectional view of the previous panel, FIG. 3 is a perspective view of an A-glass substrate according to the present invention, and FIG. 5 and 6 are perspective views of the B-side glass substrate that becomes the part means.
FIG. 3 is a cross-sectional view illustrating screen printing means for forming a short-circuit portion on the side of the drawing board. In the figure, 1 and 2 are the A-side glass substrate and the B-side glass substrate with transparent electrodes attached, a micro gap filled with three companies' liquid crystal, 6tj seal part, 8 is a 1m segment of panel display, 9Fi short circuit part, 11 is a spacer made of plastic beads, etc.;
12 is a screen printing frame, 13 is a squeegee, 14 is a screen, and 15 is an emulsion coating surface. Figure 1 Figure 2: Figure 45

Claims (1)

[Claims] (1) A-side glass substrate and B-side glass substrate on which transparent electrodes are attached and facing each other with a microgap, a spacer part that provides the gap between the substrates in parallel, and a seal part that injects liquid crystal into the gap and seals it. and A on the Bll glass substrate outside the seal part.
In a liquid crystal display panel configured by arranging the transparent electrode short-circuit parts of we to the glass substrate, the seal part was formed on the glass substrate A side, and the spacer parts were uniformly dispersed over the entire surface of the glass substrate B side. Afterwards, the A-side and B-side glass substrates are bonded together to assemble a display panel. 1* A method for manufacturing a liquid crystal display panel. (O) In the manufacturing method described in the preceding paragraph, the plurality of short-circuit parts arranged in an array on the B-side glass substrate are formed by screen printing a conductive paste on the spacer part and the panel electrode part of the formed board. 3. In the screen printing device according to claim Q, the screen original plate has recesses that do not come into close contact with the spacer forming surface of the B-side glass substrate, and A method for manufacturing a liquid crystal display panel according to claim (2), characterized by a printing means that provides residual retention. In the screen and lean printing described in claim (2), The printing squeegee is
Claim (2) characterized in that, if a recessed portion is provided that does not press the spacer forming surface on the side glass substrate, the printing means is used to preserve the spacer remaining on the B side glass substrate. The method for manufacturing the liquid crystal display panel described above.